Highly recommend ARC Studio from IK Multimedia. Includes the mic to take measurements of your room, and then the software to correct it, and finally the hardware piece to load it into that sits between your interface and monitors so you don’t have to keep toggling a plugin on and off like Sonarworks. I’ve read numerous reports from guys that have compared it against their $8,000 Trinnov systems and says they’re nearly identical, and the Arc Studio is like $300. But before that you’ll need to invest in the thickest bass traps you can find. Look at the GIK Acoustics website. Also, a nice overstuffed couch against the back wall can help too. It takes mass to absorb bass frequencies, that’s why everyone has problems with them. If you’re finding you have less bass than you want, it’s most likely that you have phase cancellation. You might be able to fix that by moving your position around. Also, what kind of sub do you have and where is it placed?